Navigation Lights

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Pushing Vessel < 50m

The exact orientation of the sidelights seen from forward may be different (the pushed vessel may obscure the sidelights of the pushing vessel entirely)

It is a common mistake to confuse normal pushing operations with that involving a composite unit. If it were a composite unit (ie: built for puishing and rigidly connected), it would be lit as a single vessel.

Vessels Not Under Way

Vessel < 50m At Anchor

Remember, it is impossible to tell in many cases when only a single white light is seen - what this may mean (stern light? vessel at anchor? distant vessel where only the masthead light is visible over the horizon? etc...)

Vessel Aground (alternate posibility)

For a vessel < 50m only one white anchor light may be shown.Memory Aid: lights for a vessel aground are identical to those for a vessel at anchor with the addition of the two red lights.

Since the rule does not specify exactly where the two red lights should appear in relation to the anchor light they may appear either above or below the forward anchor light.

Vessels Restricted in Their Ability to Maneuver

Vessel Restricted in Her Ability To Maneuver > 50m in length or < 50, in length showing the optional second masthead light.

aft

forward

starboard

Vessel Restricted in Her Ability To Maneuver > 50m in length or < 50, in length showing the optional second masthead light.
see Rule #27

Since being restricted in their ability to maneuver is always "due to the nature of her work" many vessels will also display other lights. However, if the lights are not shown (with the exception of mineclearence) the vessel is not afforded any special consideration.

The specific location of the Red, White, Red lights is flexible within the provision of the rule

Vessel Restricted in Her Ability To Maneuver Towing < 50m in length with tow < 200m

aft

forward

starboard

Vessel Restricted in Her Ability To Maneuver Towing < 50m in length with tow < 200m
see Rule #27

Per the rule this applies to a power-driven vessel engaged in a towing operation that severely restricts the towing vessel and her tow in their ability to deviate from their course

In practise few towing vessels display these lights despite being severly restricted in their ability to maneuver ie: towing a log boom.

Vessel Restricted in Her Ability To Maneuver Towing > 50m in length with tow < 200m

aft

forward

starboard

Vessel Restricted in Her Ability To Maneuver Towing > 50m in length with tow < 200m
see Rule #27

Per the rule this applies to a power-driven vessel engaged in a towing operation that severely restricts the towing vessel and her tow in their ability to deviate from their course

In practise few towing vessels display these lights despite being severly restricted in their ability to maneuver ie: towing a log boom.

Vessel Restricted in Her Ability To Maneuver conducting underwater operations where an obstruction exists

aft

forward

starboard

Vessel Restricted in Her Ability To Maneuver conducting underwater operations where an obstruction exists
see Rule #27

Memory Aid: In the case of an obstruction "Green means go" the red pair indicate there is an obstruction on that side.

In practise, there would probably be some kind of notice issued (Notice To Shipping) in these cases.